I've been told by my vet who is an international goat judge and small ruminant specilaist that there are a lot of problems with the Sweetlix. It's palatable and so the goats eat too much resulting in stones. She has warned me to not feed it free choice, or better to switch to another mineral. Just FYI.
She says 60% of the goats she's taking stones out of are on Sweetlix. It's popular but is startign to be a problem.